Yarn: 32S*2 more lightweights, it is very important to wear lightweight socks when you play trampolineElastane: spandex covered nylon, stroger and elasticityGrip: the area covered more than 72% of the bottom, more grips are most important for trampolineKnitted size inside of the top, it is easy to know the size of each sockToe seamling yarns: nylon stronger toeRubber support your arch